If your AC is running but not cooling your room, you are not alone. Every summer in Kolkata, thousands of people face this exact problem. The fan is blowing, the unit is making sound, but the air coming out feels warm or barely cool.
AC not cooling in Kolkata is one of the most common complaints we receive every summer.
This guide is written by the technicians at One Point Solution who handle AC not cooling complaints across Kolkata every single day. We are going to tell you exactly what is happening, what you can check yourself, and when you need to call a professional.
Why AC Not Cooling is So Common in Kolkata
Kolkata’s climate is genuinely brutal on air conditioners. Most cities in India deal with either heat or humidity. Kolkata deals with both at the same time.
This is exactly why AC not cooling in Kolkata complaints spike every April and May.
When temperatures cross 38 to 40 degrees and humidity sits above 75 percent, your AC is doing double the work. It is not just cooling the air. It is pulling moisture out of it too. This puts enormous stress on the compressor, the coils, and the refrigerant system.
Add to that Kolkata’s frequent voltage fluctuations, dusty air, and the fact that most people run their ACs 12 to 16 hours a day through summer, and you have a recipe for a unit that slowly stops cooling without completely breaking down.
The good news is that most AC not cooling problems have a clear cause and a straightforward fix. Let us go through them one by one.
7 Real Reasons AC Not Cooling in Kolkata Happens Every Summer
1. Dirty or Choked Air Filter
This is the number one reason we see in Kolkata, A choked filter is the leading cause of AC not cooling in Kolkata homes. Air filters collect dust and debris over time. In a city as dusty as Kolkata, filters can get completely choked in just 3 to 4 weeks during peak summer.
When the filter is blocked, air cannot flow through the system properly. The AC keeps running but the cooling output drops significantly. You feel warm air or very weak airflow from the vents.
What you can do: Switch off the AC. Remove the filter from the indoor unit. If it looks grey and thick with dust, wash it gently with water, let it dry completely, and put it back. Run the AC again and check if cooling improves.
If this fixes the problem, set a reminder to clean your filter every 3 to 4 weeks through summer.
2. Low Refrigerant Gas Level
The refrigerant is the substance inside your AC that actually absorbs heat from your room and releases it outside. Think of it as the blood of your AC system.
Low refrigerant gas is the second biggest reason for AC not cooling in Kolkata.
When the gas level drops due to a slow leak, the AC loses its ability to cool the room. The compressor keeps running, electricity keeps getting consumed, but the room stays warm. This is one of the most common AC not cooling causes in Kolkata.
Signs that point to low gas: the room is not cooling even on the lowest temperature setting, you can see ice forming on the copper pipes or outdoor unit, and the indoor unit is producing a slight hissing sound.
What you can do: This one needs a professional. Gas level checking and refilling requires specialized equipment and a trained technician. Do not let anyone refill gas without first checking for and fixing the leak. Refilling without sealing the leak means the gas will leak out again within weeks.
3. Dirty Condenser Coils on the Outdoor Unit
The outdoor unit is where your AC releases the heat it has absorbed from inside your room. The condenser coils do this job. When these coils get coated with dust, dirt, leaves, or grime, they cannot release heat efficiently.
The result is that the heat stays trapped in the system and the AC struggles to cool the room. In Kolkata’s dusty environment, outdoor coils can get dirty quickly, especially if the unit is installed in a tight space or near a road.
What you can do: Look at the outdoor unit. If the coils look visibly dirty or if there are leaves and debris clogging the fins, a professional jet cleaning of the outdoor unit is needed. Never try to clean coils with a hard brush as this can bend the fins and cause more damage.
4. AC Running in Fan Mode Accidentally
This sounds simple but it happens more often than you would think. Someone accidentally sets the mode to Fan instead of Cool on the remote. The AC blows air, the unit sounds normal, but there is no cooling happening at all because the compressor is not running.
What you can do: Check your remote carefully. Make sure the mode is set to Cool (usually shown as a snowflake symbol) and not Fan or Dry. Set the temperature to at least 4 to 5 degrees below the current room temperature.
5. Frozen Evaporator Coils
This is a tricky one because it feels contradictory. Ice is forming on the unit but the room is not cooling. How?
When airflow is restricted due to a dirty filter or when gas levels are low, the evaporator coils get too cold and ice starts forming on them. This ice layer actually blocks the coils from absorbing heat from the room air, so the AC stops cooling effectively.
Signs to look for: water dripping heavily from the indoor unit, visible frost or ice on the copper pipes near the indoor unit, and very weak airflow.
What you can do: Switch the AC off completely. Set it to Fan Only mode for 30 to 40 minutes to let the ice melt. Then check and clean the filter. If the problem comes back, there is an underlying cause like low gas or a dirty coil that needs professional attention.
6. Compressor Not Working Properly
The compressor is the heart of your AC. It pressurizes the refrigerant and drives the entire cooling cycle. When the compressor starts failing, the most common symptom is exactly this: AC running but not cooling.
A failing compressor is the most serious cause of AC not cooling in Kolkata.
You might notice that the outdoor unit starts with a humming sound and then goes quiet. Or the outdoor unit fan is spinning but you cannot hear the compressor engaging.
Compressor issues are serious and expensive if ignored too long. They are often caused by running the AC with low gas for extended periods, voltage fluctuations, or simply old age.
What you can do: This requires a professional diagnosis immediately. Do not keep running the AC if you suspect compressor trouble. Running a failing compressor can cause complete compressor seizure which is a much more expensive repair.
7. Undersized AC for the Room
This is a problem that never gets diagnosed because people assume their AC is faulty when the real issue is that the unit is simply too small for the room.
A 1 ton AC is designed for rooms up to around 120 square feet. A 1.5 ton for up to 180 square feet. If you have a large room with high ceilings, west-facing windows, or multiple heat sources and your AC tonnage is insufficient, the unit will run continuously without ever fully cooling the room.
What you can do: Measure your room and cross check with the recommended tonnage. If the AC has always struggled to cool the room even when new, this is likely the reason and upgrading to a higher tonnage is the only real solution.
Step by Step: What to Do Right Now
If your AC not cooling in Kolkata problem just started, follow these steps.
Step 1: Check the mode on the remote. Make sure it is on Cool, not Fan or Dry.
Step 2: Check the temperature setting. Set it to 18 to 20 degrees and wait 10 minutes.
Step 3: Switch the AC off completely and check the air filter. If it is dirty, clean it and restart.
Step 4: Look at the outdoor unit. Make sure nothing is blocking it like furniture, boxes, or overgrown plants.
Step 5: Check if there is ice on the copper pipes or indoor unit. If yes, switch off and let it thaw before restarting.
Step 6: Listen carefully to the outdoor unit when the AC is running. If the outdoor unit is completely silent while the indoor unit is running, call a technician immediately.
If none of these steps solve the problem, it is time to call a professional.
When to Call One Point Solution
Some AC not cooling problems can be fixed in 5 minutes by cleaning a filter. Others need proper diagnosis and repair by a trained technician.
These are the most common signs that your AC not cooling in Kolkata needs expert attention. Call us if:
- The room is not cooling even after cleaning the filter and checking the mode
- You can see ice on the pipes or heavy water dripping from the indoor unit
- The outdoor unit is making unusual sounds or staying silent
- The AC trips the MCB repeatedly when you try to run it
- Your electricity bill has shot up but the cooling has gotten worse
One Point Solution’s technicians serve all areas of Kolkata including Salt Lake, New Town, Rajarhat, South Kolkata, Behala, Tollygunge, Jadavpur, Dum Dum, Shyambazar, Park Street, Howrah, and surrounding areas.
We carry gas refilling equipment, spare parts for all major brands, and diagnostic tools on every service visit so most AC not cooling problems get resolved in a single visit.
Call us at +91-6290865017 or +91-7011815645 Or book online at onepointsolution.net.in
How Much Does AC Not Cooling Repair Cost in Kolkata?
| Problem | Approximate Cost |
| Filter cleaning | Rs. 300 to Rs. 600 |
| Gas refilling (per kg) | Rs. 1500 to Rs. 2,500 |
| Jet cleaning of outdoor coils | Rs. 700 to Rs. 1,200 |
| Capacitor replacement | Rs. 500 to Rs. 1,200 |
| PCB repair | Rs. 1,500 to Rs. 5,000 |
| Compressor repair | Rs. 6,000 to Rs. 18,000 |
Fixing AC not cooling in Kolkata early always costs less than waiting for a bigger breakdown. A gas refill today costs Rs. 1,500. Ignoring it for two more months can lead to compressor failure that costs Rs. 12,000 or more.
How to Prevent Your AC from Losing Cooling in the Future
Clean the filter every 3 to 4 weeks during summer. Get a professional service done once before summer begins and once after monsoon ends. Install a voltage stabilizer if your area has frequent power fluctuations. Do not run the AC continuously for more than 8 to 10 hours without a short break. Keep the outdoor unit clear of any obstructions. Sign up for an Annual Maintenance Contract so all of this gets handled automatically without you having to remember it.
Frequently Asked Questions
Why is my AC running but not cooling the room?
The most common reasons are a dirty air filter, low refrigerant gas, frozen evaporator coils, or a failing compressor. Start by cleaning the filter and checking the remote mode. If that does not help, call a technician for a proper diagnosis.
AC not cooling in Kolkata is most commonly fixed by cleaning the filter first.
Can I fix AC not cooling myself in Kolkata?
You can clean the filter and check the mode yourself. Everything else like gas refilling, coil cleaning, and electrical repairs needs a trained technician with proper tools and equipment.
How long does it take to fix an AC that is not cooling?
Most repairs like gas refilling, filter cleaning, and capacitor replacement are done within 1 to 2 hours in a single visit. Complex issues like PCB or compressor work may take longer depending on parts availability.
Is it normal for AC to not cool on very hot days in Kolkata?
It is normal for an AC to take longer to cool a room when outside temperatures are extreme. But if the room never reaches your set temperature even after an hour, there is likely an underlying issue that needs attention.
How often should I service my AC in Kolkata to avoid cooling problems?
At least twice a year. Once in March before summer peaks and once in October after monsoon. If you use your AC more than 10 hours daily, quarterly servicing is recommended. Kolkata’s heat and humidity make ACs work much harder than in other cities.
My AC was cooling fine last month. Why did it suddenly stop?
Sudden loss of cooling is usually caused by a refrigerant leak, a blown capacitor, or a tripped protection switch in the outdoor unit. These can happen quickly without warning. A technician visit will identify the exact cause within minutes.
One Point Solution is Kolkata’s trusted AC repair and service company. We provide fast, transparent, and reliable service for all AC brands including Daikin, Voltas, LG, Samsung, Hitachi, Blue Star, Carrier, Panasonic, and Godrej.
